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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27154472fa051be58cf48b3fcd1c8f3c351e26ebdb56889f02dc4575c7392796' 
  AND token = 'Iq5eKa0Aa6TD6BHY4/d1L00Ri49EWWjYrKLEzHEYnHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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