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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79808a3522db9d9a8cfbf3f5847200805aabac95c5b54c9daea2c47f7bb1144c' 
  AND token = 'Z89Tw68zhVk5Sc7v79sW5wArsXiLOpDfZrr7g3c0C3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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