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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f012c8d35863bedf5c81fbc89c33d8c76fda712786da2c8884755d8b049680ac' 
  AND token = 'q5Ymc/7si7ED39e1LnnwsNccweLnLWyj3Q+GTAndeis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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