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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a1b2a3ede19a0664f0f6c2aa5ef5c14fab30ec873d52cfa77ca3b0c1604b0a6' 
  AND token = '06Ob2LdYKunNFvSmeUcvFclUDvPiVMO51g/7OuLpTt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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