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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be6d81e3551cd692a46abb498ad232be63133d14617f700346d6b5667ef796a5' 
  AND token = 'mzn7CcEel52S7AR9hb+L/840C9byfe/rXoLognhaJyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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