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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57f67d728ef3ffec74b7549766d55714eff6bcb982bc8dbb1063e2b558879cd1' 
  AND token = '8Fl+V8LzPPxPL49Tj6T3SyzvS3qg4rgMZdZ7NMKz8UI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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