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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed61744c0253c1315e8ba6467ccb438ba43e424fb0531d30ce01c0134f518aa2' 
  AND token = 'mtLS9a/DHIVpHDOxSGFEd2DJOGE1iP+dKpKO857knQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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