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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ad424301e8f50d48e2d324a1d46c3e0b4229862a2462b1737546ab14fda0bd2' 
  AND token = '4vP0/4qvoeFOsHP/DWHrJth44mA4YNrQowxkCbryRKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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