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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80813a981f2db5f26911cf55206964ffab7745d9445dad0feeea3384c55d5105' 
  AND token = '3beJY6D4LfcYgqbEDVPxf0hr1/oOjOUtnhRx9gXw3+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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