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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70a8cc2326cac9e74c46a778af3b720edd4fb10209274494341f6c16477ba7d6' 
  AND token = 'SAk5aTOs5AANJ/bFSTG1/LTrJRt8q1vM865Lj33HA38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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