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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '051171e173000690ebd2b0dd6129d8d2790136ea7d729afa2c4bb369e3b84396' 
  AND token = 'V9Toh4r9Um9WMbdmO5T7/VRurFmTNC9mNb6NZR3qTRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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