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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dce05820c04af49c03a87ad029abd19ea574a31c63ac822a8c3bb626debed89' 
  AND token = 'NzB9t/Sq8gaYZ01XgfJ05FzWe09Nxwv43hr9tM7xowU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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