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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d671e4d41f0b530dba9a0b3a048e546e992b55102ef0792caf77a096f85a85b' 
  AND token = 'vfU+w4D6olWnab8DQGlNTXxcobVe3EXsuHd6tFS8nho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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