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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c37144141db071986fc42d6116edc70bfe2b175434442869316fe1c429cb53f0' 
  AND token = 'rgYpBeh+bP7hv0IX8qPwub4o+EK456iOUkSXubHYxjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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