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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54b9898aca2494a347383545708d69526e8bc5b2fcb6ff4a2f12ae68485133dc' 
  AND token = 'wBYorjE0gySN52ZzcT2QCZ4ndxy41pAeQqGq0WsoIyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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