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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e78083c62d68dcab90e2ddf91a7d3173b10ccec3bff6709f7e1c469fd6336537' 
  AND token = 'Kvf1FfiGimPUoBNccbSs9AmnSled2Xeylh2wuwswhLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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