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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96b028b0b1cc090d20102b61ba8c1d1154ea6018deb2321eae0225f88294f813' 
  AND token = '5fEpOJOV4dExkBshbnb6130wNXC2+7jiIq2ZztbkDSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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