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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d88ff39b298f8debbd287236a6a0fb8be42b399351e7e3f6091470c05e99fae' 
  AND token = 'Io08xjFrqbEZmhyBw7NJCgKqgkQQBEo/J8No9ZrCm6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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