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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08031dbddcc169d4145dbd128ec6fdf3a11fff54d00db485d9a16a5d52c47907' 
  AND token = 'nsS/e/0Rk4/UV4LPKbwsY5bNBJXg/XX5D0Wmrw2zGUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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