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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4eaf0dd7fd1d6936a00306f9c0ab190e2956a3c4bf3ce39b940cc556ee98bdbf' 
  AND token = 'hdE4r/BJ1SkNUgOkT4bgvGeRIBpkMoRoDDXi39Yryyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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