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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fc7e4d2c59a4d6ce7261fbbb55e4cbc0921c02e1a8556f834ed9ffaa5a1a33e' 
  AND token = 'AoTSZ43TmX1Nky6ucc7DR76BguIB/aHxFhkNIHZw4z0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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