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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3586a57dd614f7cf04b26e0a47ce7d8203964f3a20007f2628576d41f056897e' 
  AND token = 'a2kQ2CnGPSKFAtUmoaHFFKffCGVq+BEeac33+4mg4ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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