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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55abd4f92b8fa8410da9e7b13a859c4e7aff5ea223dc9346d18735558b1fa555' 
  AND token = 'CtrM6/20gPNRjP6Ds84RdecBJ176RrmJL12ulSaQ+JU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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