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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bea60cf2692d8074d12c1a8caa6d44af0118d0e5f7792032e423a831bd6ed5da' 
  AND token = 'tjVemnfQmcKlunGKw/3AF01ZeHISmGS8S5GsY1W0x/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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