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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95f871b32e313eb44d1cc06ce44c12853e5c83fad72347f5c76c2fdd15e73e82' 
  AND token = 'KjquFBGYK/FT93yOlOh6TALrWlyuzOoLqr2sQIpU7B4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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