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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db884c5de4f88eae7e0751a2389e6d37aff518c6a24fedab5c675c8bebd6c41e' 
  AND token = '58AXvNBJJryFbsP5ZcUr4eSiqeOGy8zJTLg3R4eG4c4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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