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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '805c2cc2d2720a0afba0503299f37669c2e9fc46dfbac1cc3876e00a354198e8' 
  AND token = '7N6bccCslPtdVn6xtwmJWTOVGVpROnFVbdU0wcxJP80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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