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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8da733ff9e3e036d455929af8a4b3113e84b239403123a903d6070548f1d46ba' 
  AND token = '7jtWCl4skMJ/Z/ZcnwgebHkCuBloqL1M2sd/Mn/1b3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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