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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b13ce83c01ec448cda0ffe887c5d6b847e2feabb663af500850236de6ea86597' 
  AND token = 'k5Me85pGPATocf/SFOYJiVza2DfhejGpXi5Dbvp8fLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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