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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f7f92dd6d29cbe5992bdaa7e08aa61aa3a3a176f178db5c997886f551164bb4' 
  AND token = 'm0o9NOzmuox28tMteh0RsBEUcs5P5Xn4scbvOcAxF2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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