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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a34168032b018e9dab71794ca69e66da870c0f4ec59c5216f1c006c8dc0d787' 
  AND token = '8uehhU3CwjzCmels1H09JgeACbQuYeAFDZhdUmYjtus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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