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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb3adc4c25206b6759c79e9d96163981839295e975f31f866508c2e2679bb99b' 
  AND token = 'bAY3YTPr565CKQZmzR1yTnXKU+T2as0CPBGW4Yvbydg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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