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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87d68c6b34005f49a5db9956ff774e5d6d187f68fc8a0310a618d2000b2c10b9' 
  AND token = '5Alre7Go01w11KLtp4jzMteDlM5WugiDasV+uwrNY4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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