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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63d3337bb6cd5607c4cc896aa97dc02a8017ef1f20222da5234cf0e4a9f5eee9' 
  AND token = 'bT6eCJ3D3H2AdM9dAOJ1lUxkPm43MTnVxEub0+U1rlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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