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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '603744ecad0a61b57909db6bc0ffed5686c0fad535f1b78f7540954dd6a158a2' 
  AND token = '+iwPw876GoeXTiwizJLQXhMoXgVFP7Yi5yx5/tCWELM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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