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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f59e9ff73efeaeddeb34f0d9162866078dc80569e23e4d0f4da95a80c5c2c679' 
  AND token = 'gx6k1YXMhm/h23/xrFvel8Xh4zL6crjkDs73kmobu9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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