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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5656f1007968b9523c7e691218431b29019531eecf76dbd2520259d13c824527' 
  AND token = 'klz65T4SDOR80g92z0gL+HiqAr+b35Q/CIEzau2P6kE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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