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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f514bb0d3a276b6a550c3aa3ed112fd7e123c2fcdf9bc8ec0b90f420760c1b7' 
  AND token = '2QL3jBvGytPYisCdmSJkQEkZOHabDSjYn0SGoANYiW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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