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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96c899ceedaa676714a2e7f7179e722341a4ac42b514c7fa1d957fe7fbcd5f5d' 
  AND token = 's+1ZoTLmQJDJyJdJJu+gN6z1RxHXi5WAskXxT0Jj/d0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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