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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c03d731985feecacc2eff3423677c92636afeda02c3e513fee9d84ad0ba3e101' 
  AND token = 'FDQ/69n9jB1ckCav3ajFP27evZOJKDqPQMLvHKmU+o0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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