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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb0af6c1b9ea8fdebaf27a32837990cdfd238bb330b7f888035ab7840720e4dd' 
  AND token = 'kpSGsFzc7iP+3WOYE0u/rdpYdEFVQEFZpohU/E+nlb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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