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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cdcaee5b62d39940f81f4f50ff20fdf224cc21497ed13d96d0bf1d22c767e1c' 
  AND token = 'o2WEM1sVujojUJ/c3k+WBb3AcaFvUCUhopK8KnYPDj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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