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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ee0052b2cbef3a7bbfb2b97a84177652f68c196c3a2adb9d630b8ee1850d34a' 
  AND token = 't9bEyW0cF6HkshDvdlYrFi7t2s1uLjV/KXQz/mo/y6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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