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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '570f8a19e1c377a266f9ff87fc6dfa532d7f66e0b14653dbdc4668e06736932d' 
  AND token = 'L0CG4A5fNLZyHFZa5t0EGA8iiQczYip8Oqz0u/yOmEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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