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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10f91dc8a8b9515a03414fd2e0bb5338d3916654be2388809f0cf53ed7f5b89b' 
  AND token = 'uCqBJF+BvarwOOhJp8kSA/0HnNDRWtfPy3Oy6t6ZyO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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