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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de09aadc3977f157a2903a3e8f10bb9e88502c95e8a10801eb2cc8d8380c6f3a' 
  AND token = 'c1bqr3Q/Ov2McZzUQ/t9uRGSDU2qRhhioU/zfDQe9+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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