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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21d86c2049ed99b809009e10a122b0b112890520b97fb4dd879e38ad5e4672fe' 
  AND token = '3lPEtv6KmSbADA8Ha/2D6DIOjI4nCNAQoWo7Q+8BzOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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