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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1ef74d973ec87090b57b3e0c1f0dbe8247ff1332554aaea595892ffb1040647' 
  AND token = '7cNSfESGGmvKeN/3uyNriX0cDcxop3z4Gi+TpUtglrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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