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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eb3cdaa77fdadfe7c499345d029910a6c36a2b19a5a1fe25631bf9d5e6e58cc' 
  AND token = 'xJLs/vr6Ub7a/eISZHDkEOQDQ7MAfiWlSbCNjMsiRLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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