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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f92b11e5ba715603a929e9be51e4a4041ad35884101b18f0365f950590a05cd' 
  AND token = '6V4uJTimYVna1xKWvAg2ZO/kcHqweibLLSEoF65ELC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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