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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1aea38b0afbac7bb5e6f5a42cc70599c96b5eba7c6347a3896f244cf5f10fe4f' 
  AND token = 'bvnc7LenS8i0Knyjm1waiRNljHDrojv0HsBveRmyNk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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