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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c8cdcc0741abc2974860898bef1fc5ebd669ceed43b385a94567090b0993352' 
  AND token = 'YLcilygiOT6WmS3OXUx2A1W+jGan6ZrZKl9YoaYL60M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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