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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '804736701d4bfb1866af6812e7dfb1b3703320025f443a494f0ae5783ed848c6' 
  AND token = '9owauNYX93cvewkgVeMm6shXP18tXtw/jXqSdyb5x3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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