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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82a74c5d0eccacb7e1055090d4726afbf3e54232deef4b2a2a9e72ca3757bc89' 
  AND token = 'fRwKdB4jeN3ObzczE7/ohOPe0lQiE8AZcUdLns/m31I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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