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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9776604020c4b6ef5a5a94db48829497147e30540265f3f2c4bdfde8225e1cc6' 
  AND token = 'G/IoiMgG9YN/MgF8LCXZ56YW3Haau4GNXsgqmABsPF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}