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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76c47d6b2a6587ccaf7866913dd67f1d564c3cfa615392bb493807e41cd0f8fb' 
  AND token = 'A32phIa52pfI8UVA/DQHosF74FdgGU3Uc0lvik4kBok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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